Stuffing box, gland, and packing therefor



L. ULLMAN STUFFING BOX, GLAND, AND PACKING THEREFOR Fil'ed Jan. 25. 1922L L; U ///11a.n

INVENTOR 4 ATTORNEY.

STUEG G, PA a! pplication filed January as, 1 t =3 To all whom it mayconcern: Be it known that I, LOUIS ULLMAN, citizen of the United States,residing at New York city, in the county of New ork and State of NewYork, have'invented certain new and useful Improvements in StuflinBoxes, Glands, and Packing Therefor, which the followin is aspecification.

My invention re ates to stufling boxes, glands and packing therefor, ands particularly adapted for use in door closing devices of the type whichcombines a powerful spring for closing the door and a piston moving in acylinder agalnst a liquid to check or control the closing action of thespring.

The primary object of the invention is to improve the construction ofsuch dev1ces and to reduce to a minimum any possible leakage of theliquid through the stufling box.

In stufiing boxes used for thls general work, it has been found thatwithin a relatively short period of time and under normal conditions theacking surrounding the operating shaft ecomes loosened and smallquantities of liquid are permitted to escape into the spring chamber.The result of such leakage will cause dripping of the l1qu1 d from thedevice and will ultimately impair the checking action of the device.

It is believed, however, that the rapid deterioration of the packing isnot alone due to any particular means used to hold the packing in thestufiing box, but to the general design of the latter, which does notprovide supporting means for the crank end of the operating shaft. As aresult, the tremendous pressure exerted against the lower portion ofthis shaft by the combined energy of the spring and resistance 0% theconfined liquid, sometimes reaching a maximum pressure of two hundredand fifty pounds to the square inch, tends to ofiset the alignment ofthe shaft with a consequent loosening of the surrounding packing.Therefore, it IS a further object of the present invention to provide asuitable supporting bearing for the operating shaft between the packingand the crank arm, the said bearing bein formed by a substantiallyintegral part of e stufiing hbox.

e invention is illustratively exemplified in the accompanyi drawings, inwhich- Figure 1 is a si e elevational view ofa door closing device withparts shown in sec- Serial no. 591,.

tion, the operating shaft, and the stuflin box for supporting the saidshaft above an below the-packmg.

Figure 2 is a. substantially sectional view of a slightly modified formof the operating shaft, stufling box, land and packing.

Referring to the rawing and particularly to Figure 1, 10 designates thecasing of the door check and closer and 11 the spindle or operatin shaftpro ecting vertically an axially t ereof to which the usual lever arm(not shown) is secured. The interior of the casing 10 is divided intotwo compartments 12 and 13, the former located in the upper portion ofthe casing and adapted to contain the coiled operating spring 14, andthe latter compartment is cyhndncally shaped and the axis of which issubstantially at right angles to the axis of the other compartment 12.This cylindrical chamber 13 is adapted to contain liquid against which aa piston 15, moving in the'cylinder, is operated by rotary movement ofthe shaft 11.

'The piston 15 is operated by the lower end of the shaft 11 through aconnecting rod 16 and crank arm 17, the latter being rigidly secured tothe extreme lower end of the shaft. The partition 18 between the up erand lower chambers 12 and 13 is provide with a threaded opening 19through which a stuffing box 20 is projected. The stufling box 20 isaxially aligned with the o erating shaft 11 and provides two owerbearings for the latter adjacent its lower end. The stufing box itselfcomprises a casing 21 having an enlarged hexagon head 22, reducedcentral portion cylindrically shaped and exteriorly threaded to bereceived by the threaded opening 19, and a still further reducedcylindrical lower portion having a bore 23 to hear about the lower endof the shaft 11. The head 22 is rovided with an annular channel 24projecting from the face of the head well into the interior thereof. Theouter wall of this channel 24 is threaded and the inner wall 25 is anarrow upright annular piece havin its inside or inner wall threaded.Projecte inwardly from the base of the wall 25 and on a plane slightlyabove the bottom of the channel 24 is a oating v gh, so as to allowconsiderab e space v hereinafter descrii I outwary and e s: verticallythrouh the central portion to a oulder 27, an therea dropping verticallto a nd shoulder 27 which is rovide with a continuous groove in itssurace and the inner diameter of which is the to bore 23 in the lowercylindrical portion of the one 11;: Y

:Thepac tgandglandscarried by the studing box 20 and mounted in theinterior oi the latter are above a coil wire spring 28 vw ing its lowerend seated in the groove of the second shoulder 27 and the opposite endyieldably a 1 l g with an adjustable portion of the pacg. e acg properconsists of an inner conical y shad memr having a throh bore 30 toreceive the shaft 11 and a partiall threaded lower portion to screw overthe it reads 11 of the ititself. The upper-face oi the member when inoperative position, is raised conet siderably above the pa rs-1 seat 26,so as to present an inclined surface adjacent the inner eriphery oi theseat. A second memher 0 the packing is' a conically shaped leatherwasher 31 having an outwardly prodd-"mting portion adapted to overliethe seat 'lhe inclined portion of is washer 31 rests against the corndinportion of the member 29 and is hel t tighty in position by the springsupported conical sleeve 32 which hears a inst the outside surface ofthe washer. v Zcrewed into the threads of the ier wall 25 and brought tobear tightly i w: t the projecting portion of the washer 311. overlyingthe seat 26 is a pitching nut 33 .comprism an exterior-1y threaded ringpro- .vided wit slots in its upper surface to re ceive the nibs of aspaer. The portion of the shaft 11 m iediately above the packing isfurther su ported in a bearing 34 which consists of a ub 35 having abore to receive the shaft and an outwardly projecting annular portionterminating in a dowardly disposed fige 36, exteriorly threaded andadted to be received by the threaded outer we of the channel 24. Inorder to insure perfect movent oi the shaft 11 and crank arm 17 thelatter is separated from the lower e of the being or bore 23 by abushing or wear 3?. 83 in the to oil the invention own in his 2, the tagbox casin 21 is similar to that of Fl a 1' 1, except t at the axial ogin the head portion 22 is not provided with a new but simply foe aoulder or sent d, e inner periphery of this t 23 defines the upper ed ofa packing chi-a; slightly inclined inwardly and "Ma antes in a groovedshoulder 27 adjacent the lower w d of the mes-1 21". The wall oi theopenthe suriaceot te shoulder o the central portion of the cap r it) thewall of which is is m n and seat 23 is through the casing 21 is thespindle or she 11 ving a threaded band 11 n ted to n the threaded hub 41of a pa gland 42. The annular flange of the land is provided with agrooved uner surface 43 Suppor in the groove of the milder 27* is thelower end'of the coiled spg 23 while the upper end of the latter entruth a packing sleeve it to yieldably p= port the sleeve about thesmooth outer wall ing in the head grooved. A

Mounted to operate in the openin of threaded hub 41. The e portion oi 3Y the sleeve 44 projects outwarfl to provide an annular surface ving ariphe which will loosely fit the ope throng the seat 26. The packinnular washer 45 compo of leather at: oi t a size which will fit betwnthe era inner of the wall of the casing 21 and the outer surface of thehub 41. in t described position it will noted that the washer 45 isnormally being held the under side of the packing gland 42 d theprojecting marginal portion yond the land rests on the seat 26*. Inorder to rmly fix the position of the washer 45 against ossible movementthe latter is compressed 1| tween the seat 26 and the face of a achingnut 33 in the form eta I ring threaed to fit the threads on theinnerwall of the openingin the casing 21. This ring or nut 33 is adapted tobe screwed into the space between the periphery of the gland 42 and theopposite wall of the oningo A hearing cap 36 is introduoedinto thethreaded opening in the head 21 and is moved against the packing nut andgland, being provided with a bearin hub 35 to support the portion of theshe 11 immately above the packing.

ln operation the movable members of the stufiing boxes function insubstantially the same manner, i. e., rotary movement of the spindles orshafts 11 will carry the packing glands 29 or 422 in a similar rotarymove ment, and the springs 28 will both exert an upward and yieldableressure are: the packing sleeves 32 an M. In the packing 31 is heldtightl a movable gland 32 so tt any "q it found its way into the lowerportion of the casing 21 will be unable to force its way past theconical washer and into the g 1!? a 12. it is particulerlypoin out thatas the washer 31 is dually worn down by the rotary movement of the 29the spring supported sleeve 32. amforoed upwaly against the washer tothe latter to is closely brace the as f or the land d in 21;; we acenstant liquid tight fit may he provi ed.

an an lllll lid lid

' ably naeaaia In Figure 2, the rotary movement of the shaft 11 andgland 42 will cause the latter to move relatively to the packing orwasher 45 and sprin supported sleeve 44 in which case it Willa notedthat as the washer wears away the sleeve 44 will be forced upwardlyagainst the inner marginal portion of the fixed washer 45 by the actionof the sprin 28.

It s been found that the life of the packing or washer may be greatlylengthened b grippin a marginal portion of the latter tween t e'surfaces of the seat 26 and packing nut 33 and allowing the, innerportion to remain free. In the resent invention the upper surface ofthis inner marginal portion of the packin rests against the un ersurface of the Ian and the opposite surface of the acking is yieldablyengaged by the slida le sleeve, all of which gives a substantiallyflexible liquid tight connection between the shaft and the studing box.Leakage under this construction is practically overcome and theefilciency of the checking device is not impaired by loss of liquid fromthe iston chamber.

Having describe my invention, what I desire to claim and secure byLetters Patent 1s:-

1. A stufing box for a movable shaft, comprising a casing provided witha stepped opening, a compressible packing ring margmally engaged with aste in said opening, a member movable with said shaft and relatively tothe packing rin and a ieldably supported sleeve dispose about 't e innermarginal portion of said packing ring, whereby the latter may be held incontact with the member.

2. In astufiin box for the purpose described, the com ination with amovable shaft having a projectin member, of a casing surrounding said saft and provided with a bearing at one end, a packing washer having itsmarginal periphery rigidly secured to said casing and its inner portionoverlying said member, a sleeve mounted around a portion of said washerand yieldsupported against the latter to hold it constant y in engaement with the member.

3. In a stufing ox for a movable shaft,

the combination with a casing having a stepped opening, a flexiblepacking ring marginally supported on a step in the opening, a pac ingnut movable against the ring to rigidly secure the latter to the casing,a conically sha ed member movable with the shaft and re atively to theunattached inner portion of the packin ring, a conically shaped sleevedisposed a out the packing ring to hold the latter in enga ement withthe surface of the member, an means for yieldabl supporting the saidsleeve axially of the s aft.

4. In a stufiing box of the character described, the combination of amarginally engaged packing ring, a movable member aving a projectingflange overlying the unattached portion of the acking ring and a hubportion extending tl rough the opening in the ring, and a sleeve slida1y mounted on said hub and provided with a projectin flange adapted tounderlie the unattache portion of the rin 5. In a stufling ox of thecharacter described, the combination with a casing having an openingtherein to receive a shaft, said opemn being arran ed in sections with agrooved s oulder there etween, ofa packing ring marginall held againstthe ooved shoulder an projecting inwardly nto the lower section 0 thecasing, a member carried by the shaft and projecting throu h the openingin the central unattacheg portion of the ring, a sleeve having an up erdiameter e ual to the inner periphcry 0 the said shou der and adapted tobe yieldably supported over the projecting portion of the packing ringto move axially thereof, said sleeve being adapted to constantly holdthe ring against the surface of the movable member, and bearings for theshaft adjacent opposite ends of packing members, one of said bearingbeing an integral part of the lower portlon of the easing and the otherof said bearing being an nature.

LOUIS ULLMAN.

